A new species of Denisiphantes Tu, Li & Rollard, 2005 (Araneae, Linyphiidae) from Yunnan, China

Abstract Denisiphantes arcuatussp. nov. (♂♀) is described from Yunnan, China. Detailed descriptions of somatic features, genitalic characters, photos of habitus of the new species as well as of copulatory organs of Denisiphantes denisi (Schenkel, 1963) (♂♀) are presented. A distribution map is also provided.


Introduction
Li (2020) listed 403 Chinese linyphiid species from 162 genera, of which 120 species from 44 genera belong to Micronetinae (Li and Lin 2016). Spider collections made in the Yunnan Province between 2002-2006 revealed a new Linyphiidae species herein described. The new species belong in the monotypic genus, Denisiphantes Tu, Li & Rollard, 2005. The type species, Denisiphantes denisi (Schenkel, 1963), was described based on a female specimen from Ganzu Province and it also occurs in Qinghai Province (Hu 2001;Tu, Li and Rollard 2005). The male was later described by Zhu and Li (1983). Color photos of both species are presented (Figs 1-7) as well as a detailed morphological description, a diagnosis, and a locality map (Fig. 8).

Material and methods
Specimens were collected by hand collecting and beating shrubs and were kept in 75% ethanol. After dissection, the epigyna were cleared in trypsin enzyme solution before examination and photography. The left male palps were used for description and illustration. Specimens were examined and measured with a Leica M205C stereomicroscope. Photos were taken with a digital Leica MC170 HD camera mounted on a Leica M205C and were stacked by Helicon Focus software (3.10.). The map ( Fig. 8) was created using ArcMap 10.2, and then modified using Adobe Photoshop CS2 Extended. Leg measurements are given in the following order: total length (femur, patella + tibia, metatarsus, tarsus). All measurements are given in millimeters (mm). The terminology used in text and figure legends follows Tu et al. (2005). The type specimens are deposited at the College of Life Sciences, Hunan Normal University (HNU), Changsha, China.

AER
anterior eye row ALC anterior projection of lamella characteristica ALE anterior lateral eye AME anterior median eye AME-ALE the distance between AME and ALE AME-AME the distance between AMEs  (Schenkel, 1963) in having a similar long ridge-shaped proximal cymbial apophysis of the cymbium in the male palp and a broad scape, almost hexagonal in shape in the epigynum, but can be distinguished by the following characters: (1) Lower margin of distal arm of the paracymbium with a projection, wider than long with a blunt end and covering the posterior margin of the tibia in retrolateral view in the new species ( (Fig. 3D), whereas it is hexagonal in D. denisi (Fig. 6C).
Distribution. Known only from the type locality in Yunnan, China (Fig. 8).

Discussion
Denisiphantes was described as a monotypic genus based on the material collected from Qinghai and also reported from Gansu and Guizhou. The new species described here is reported from Yunnan. Considering the vast distribution of the type species (Fig. 8), it is possible that there are still several species of this genus that need to be explored from Yunnan and across the adjacent areas to understand the distribution and origin of this genus.